Borg Mechanical Digital BL5101 – Knob Keypad Back-to-Back – Satin Chrome & Satin Stainless
The Borg BL5101 is a fully mechanical digital lock in a knob/knob back-to-back (BTB) configuration. Both sides of the door have an identical knob keypad — enter the code and rotate the knob to retract the latch. The operating experience is symmetric and identical on each side. Each keypad has an independent coding chamber, allowing each side to be set to a different code if required.
The knob format on both sides makes this the most compact BTB configuration in the BL5000 series — useful where lever handles would protrude too far or create a clearance issue with walls, frames, or adjacent furniture. Code required to open from either direction; no free inside egress. Fire rated to AS 1905.1-2005 (up to 4 hours). Fully mechanical — no batteries. Available in Satin Chrome (BL5101SC) and Satin Stainless (BL5101SS).
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The BL5101 has a knob keypad on both sides. Both sides are identical in function and appearance. Operating sequence on both sides: enter the correct code on the keypad, then rotate the knob to retract the latch. This is the most compact BTB option in the BL5000 series, as knob handles have a smaller radial projection than lever handles. A code must be entered from whichever side you are on.
Each knob keypad has its own independent coding chamber. Both sides can share the same code, or each side can be set to a completely different code. This allows access from one direction to be controlled independently from the other.
The inside knob keypad requires the correct PIN before the knob retracts the latch. Confirm this suits your application and complies with any applicable fire egress or building regulations before purchasing.
Successfully tested up to 4 hours (depending on doorset) on fire door assemblies in accordance with AS 1905.1-2005 Fire Resistant Doorsets.
Tumbler-based code system. To change the PIN on either side, that side's keypad must be removed. Remove the 4 red screws, lift the cover plate carefully (springs attached), hold the C tumbler depressed, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. Over 8,000 combinations; code length adjustable 3–7 digits. Each side is changed independently.
After entering the correct code and rotating the knob, press F to engage free passage mode on that side. The knob becomes free-turning without requiring code entry. To exit: rotate the knob and press C until an audible click is heard. Free passage is independent per side and permanently deactivatable with the included plug.
Entirely mechanical. No power source, no wiring, and no battery maintenance at any point.
For heavy duty: consider the Borg BL7701, Lockwood DX, or Carbine CDL7000.
Each knob keypad accepts one active PIN code at a time. Each side can be set to a different code independently.
Available Variants
Key Features
- Knob keypad on both sides – identical, symmetric operation from each direction.
- Most compact BTB configuration in the BL5000 range – knob profile reduces door-face projection compared to lever handles.
- Independent coding chambers – each side can be set to a different code, or both can share the same code.
- Code required from both sides – no free inside egress.
- Free passage function (F button) – independent per side; permanently deactivatable.
- Tumbler code system – over 8,000 combinations; code length adjustable 3–7 digits with spare tumblers supplied.
- Fire rated to AS 1905.1-2005 (up to 4 hours depending on doorset).
- Fully mechanical – no batteries, no wiring, no power source.
- Clutch protection on both knobs – free-turning until correct code entered.
- 8mm square drive spindle – compatible with most leading lock brands.
- 60mm backset heavy duty anti-thrust tubular latch.
- Door thickness 35mm to 54mm (standard fixings).
- Reversible on site for left or right hand doors.
- Available in Satin Chrome (BL5101SC) and Satin Stainless (BL5101SS).
What's in the Box
- Borg BL5101 outside knob keypad assembly (selected finish)
- Borg BL5101 inside knob keypad assembly (selected finish)
- 60mm heavy duty anti-thrust tubular latch
- Strike plate and box keep
- 2 × spindles (80mm and 90mm)
- M4 fixing screws (40mm, 50mm, 60mm options)
- 4 × 16mm screws
- 2 × coded tumblers (red – spare)
- 2 × non-coded tumblers (blue – spare)
- Tweezers (for code change)
- Hex wrench (Allen key)
- Handle screw rubber grommet × 2
Suitable Uses
- Internal doors where both-sided code access is required and lever handles would create clearance or projection issues
- Meeting rooms, server rooms, storerooms, and amenity doors where a compact, symmetric both-sided keypad is the preferred format
- Applications where each direction of access needs to be managed by a different user group with their own independent code
- Fire-rated internal door assemblies requiring compact both-sided code access control without batteries
- Doors where identical, symmetric operation from each side simplifies training and user management
Full Specifications
Dimensions
Frequently Asked Questions
Why choose knob/knob over lever/lever (BL5051)?
The BL5101 knob keypads have a smaller radial projection from the door face compared to the BL5051 lever keypads. This makes the BL5101 better suited where clearance is limited — for example where the door opens close to a wall, partition, or adjacent fixture. The knob format also provides a symmetric, identical appearance and operation on both sides, which can be preferred in applications where the same user experience is needed regardless of direction. If clearance is not an issue and ergonomic lever operation is preferred, the BL5051 lever/lever may be the better choice.
How do I change the PIN code?
The code must be changed with the relevant side's keypad removed from the door. Remove the 4 red screws, carefully lift the cover plate (springs are attached), hold the C tumbler depressed at all times, then use the supplied tweezers to reposition the red (coded) and blue (uncoded) tumblers. All square cut-outs must face outward; coloured marks must face upward. Each side is changed independently. Test the new code before reinstalling. The code is non-sequential — the buttons can be pressed in any order.
Can each side have a different code?
Yes. Each knob keypad has its own independent coding chamber. Change the tumblers in each side separately to set different codes. Both sides can also share the same code if preferred — set both chambers to identical tumbler configurations.
How does free passage work on each side?
Enter the correct code on one side and rotate the knob, then press F while the knob is still engaged. That side's knob becomes free-turning. To exit free passage: rotate the knob and press C until an audible click is heard. Each side is independent — engaging free passage on one side does not affect the other.
What is the difference between BL5101SC and BL5101SS?
Both are satin finish knob/knob BTB locks with identical specifications, operating mechanism, and fire rating. The BL5101SC has a satin chrome (PVD) finish; the BL5101SS has a satin stainless (PVD) finish. Neither is suitable for coastal or saline environments. Select the finish that best complements your door and interior hardware.
Is this lock fire rated?
Yes. The BL5101 is fire rated to AS 1905.1-2005 for use on fire door assemblies (up to 4 hours depending on the doorset). When specifying for a fire door, confirm all other hardware is also fire rated and compatible. Also confirm that requiring code entry to exit from inside complies with emergency egress requirements for your specific fire door application and occupancy classification.
Additional Information
For the tumbler code system, codes can be set on or off the door. Set and verify both side codes on the bench before installation. This avoids removing a fitted keypad for the first code change and lets you confirm both sides operate correctly before mounting.
Two spindles are supplied (80mm and 90mm). Use the longest that fits. General rule: door thickness + 30mm = minimum spindle length (15mm must seat into each keypad). For a 44mm door, the spindle should be at least 74mm. Do not cut the spindle shorter than necessary. A short spindle may disengage if the door is slammed, locking users out.
Both sides require code entry on the BL5101. Confirm this complies with emergency egress requirements for your specific fire door application. In escape routes, requiring code entry from inside to exit may conflict with occupancy regulations. Confirm with your fire door certifier or building surveyor before specifying for a fire door on an egress route.
All Borg locks are warranted against mechanical defects in materials and workmanship under normal use and service for a minimum of 12 months from date of sale. The warranty does not cover damage arising from misuse, vandalism, or improper installation. The lock must not be dismantled — doing so will invalidate the warranty.
What's In The Box – Borg BL5101SC / BL5101SS
- Borg BL5101 outside knob keypad assembly (selected finish)
- Borg BL5101 inside knob keypad assembly (selected finish)
- 60mm heavy duty anti-thrust tubular latch
- Strike plate and box keep
- 2 × spindles (80mm and 90mm)
- M4 fixing screws (40mm, 50mm, 60mm options)
- 4 × 16mm screws
- 2 × coded tumblers (red – spare)
- 2 × non-coded tumblers (blue – spare)
- Tweezers (for code change)
- Hex wrench (Allen key)
- Handle screw rubber grommet × 2
Borg BL5101 – Dimensions
Borg BL5000 Series – Product Brochure
Borg Locks Warranty – Australia
What is Covered
- Mechanical defects in materials and workmanship
- Defects arising under normal use and service conditions
- Repair or replacement of defective units at the discretion of the Australian distributor (LSC)
What is Not Covered
- Damage arising from misuse, vandalism, or abuse
- Damage resulting from improper installation
- Locks that have been dismantled — dismantling invalidates the warranty
- Normal wear and tear
- Cosmetic damage not affecting function
How a Warranty Claim Works
Warranty claims for Borg products in Australia are processed through LSC, the authorised Australian importer and distributor for Borg Locks. If the returned item is found by LSC to be defective, it will be repaired or replaced. Products must be returned to the LSC office with freight charges prepaid within the warranty period. A detailed assessment report is provided to the customer after examination.
Contact Terry’s Locksmiths first — we will assess the issue and manage the warranty process with LSC on your behalf. You do not need to contact LSC or Borg Locks UK directly.
Australian Consumer Law
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. The Borg manufacturer warranty above operates alongside — and does not limit — these statutory rights.
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